List of top Science Questions

What do you understand by 'short-circuit'?
How is the resistance of a wire affected by its area of cross-section?
Explain conductor, insulator, and semiconductor with examples.
What do you mean by power of a lens? Write its SI unit.
What is a simple microscope? Draw its ray diagram.
What is the law of refraction of light?
Define focus of a concave spherical mirror. Prove that in a concave mirror \( R = 2f \).
Which one of the following is a metalloid?
Which of the following equations is balanced?
CaCO\(_3\)(s) → CaO(s) + CO\(_2\)(g) is what type of reaction?
Which of the following causes acid rain in industrial areas?
Draw a labelled diagram of an electric bulb.
What is persistence of vision?
Draw a ray diagram to show refraction of light at both refractive surfaces of a prism placed in air.
Ozone layer protects earth from which harmful radiation?
Which non-metal is found in liquid state at room temperature?
Which one of the following is the natural source of oxalic acid?
Propane, with the molecular formula \( C_3H_8 \), has:
If the lower half of a concave mirror gets broken, then the image:
When a ray of light travels from air (a rarer medium) to glass (a denser medium), it bends:
The general formula of alkyne is:
Which colour of light scatters more in the atmosphere?
The far point for normal vision is:
What will be the nature of the image of an object, if the magnification of the image is negative?
How many laws are there for the reflection of light?